JP2013085123A - Receiver and reception program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a stable broadcast communication cooperation service by the reduction of a time difference at the acquisition of a broadcast content data and a communication content data.SOLUTION: A receiver includes: a broadcast content acquisition unit 601 for capturing the broadcast content data including PTS1; a communication content acquisition unit 611 for capturing the communication content data including PTSs, identical information to the PTS1; video decoders 609, 615 for extracting the PTS1 from the broadcast content data and for extracting the PTSs from the communication content data; a delay time calculator 617 for calculating, on the basis of the extracted PTS1 and PTSs, a delay time when capturing the communication content data relative to when capturing the broadcast content data; and a distribution device request controller 619 for requesting the distribution of the communication content data according to the delay time.

Description

  The present invention relates to a receiving apparatus and a receiving program.

  Currently, in data broadcasting that is digital broadcasting, caption data is encoded and broadcast. The television receiver that receives the digital broadcast can also receive the caption data and display the video and the caption on the screen (see, for example, Non-Patent Document 1).

  In recent years, research for realizing a broadcasting / communication cooperation service has been conducted. As an example, this broadcast communication cooperation service is a broadcast program content broadcast from a broadcast station side to a receiving device used by a viewer, and a distribution distributed from a service provider side via an electric communication line such as the Internet. This is a service for receiving content and reproducing the broadcast program content and distribution content in cooperation with each other.

“Data Broadcast Coding and Transmission Standards for Digital Broadcasting”, ARIB STD-B24, 5.4 edition, Volume 1, The Japan Radio Industry Association, December 16, 2009, Volume 1, Part 3

  For example, when a caption providing service is realized by the broadcast communication cooperation service, a receiving device that receives broadcast program content broadcast from a broadcast station and receives caption data distributed from a service provider is capable of displaying captions. The timing must be matched to the display timing of the program video to some extent. However, transmission delays may occur in telecommunication lines such as the Internet due to traffic, and the transmission delay time may vary depending on the degree of the traffic. If this transmission delay time becomes long, the delay of the subtitle display timing with respect to the display timing of the program video cannot be ignored, which hinders TV viewing.

  The present invention has been made in view of the above circumstances, reducing the time difference during data acquisition between broadcast content data obtained by receiving a broadcast and communication content data obtained by receiving a distribution, It is an object of the present invention to realize a receiving apparatus and a receiving program capable of realizing a stable broadcasting / communication cooperation service.

[1] In order to solve the above-described problem, a receiving apparatus according to an aspect of the present invention includes a broadcast-type content acquisition unit that takes in broadcast-type content data including first time management information that is broadcast from a transmission apparatus; A communication system content acquisition unit that receives communication system content data including second time management information, which is the same information as the first time management information, distributed from a distribution device via an electric communication line; The time at which the first time management information is extracted from the broadcast content data captured by the content acquisition unit, and the second time management information is extracted from the communication content data captured by the communication content acquisition unit Based on the management information extraction unit and the first time management information and the second time management information extracted by the time management information extraction unit, A time difference calculation unit that calculates a time difference at the time of capturing the content-based content data and the communication-based content data, and a distribution apparatus request control that requests distribution of the communication-based content data according to the time difference calculated by the time difference calculation unit And a section.
With this configuration, the receiving device according to one aspect of the present invention compares the first time management information included in the broadcast content data and the second time management information included in the communication content data at the same time, The delay time of the second time management information of the communication system content data with respect to the first time management information of the broadcast system content data is acquired, and a distribution request for the communication system content data is made to the distribution apparatus according to this delay time. be able to.
Here, the broadcast content data and the communication content data are, for example, transport streams, and the first time management information and the second time management information can be, for example, PTS, PCR, or DTS. .

[2] In the receiving device according to [1], the communication content acquisition unit is the same information as the first time management information distributed from a plurality of distribution devices via a telecommunication line. Each communication system content data including 2 time management information, the time management information extraction unit extracts the first time management information from the broadcast content data captured by the broadcast content acquisition unit, The second time management information is extracted from each communication content data captured by the communication content acquisition unit, and the time difference calculation unit includes the first time management information extracted by the time management information extraction unit and Based on the second time management information, each calculates a time difference at the time of capturing the broadcast content data and each communication content data, The delivery device request control unit makes a delivery request for the communication content data to the delivery device corresponding to the shortest time among the time differences corresponding to the plurality of delivery devices calculated by the time difference calculation unit. It is characterized by that.
Thereby, the receiving apparatus can acquire communication system content data in which the time difference between the broadcast system content data and the communication system content data is minimized.

  [3] In order to solve the above-described problem, a reception program according to one aspect of the present invention obtains broadcast-type content data that includes a broadcast-type content data including first time management information that is broadcast from a transmission device. A communication content acquisition unit that captures communication content data including second time management information that is the same information as the first time management information distributed from the distribution device via a telecommunication line; The first time management information is extracted from the broadcast content data captured by the broadcast content acquisition unit, and the second time management information is extracted from the communication content data captured by the communication content acquisition unit. A time management information extraction unit to be extracted; and the first time management information and the second time management information extracted by the time management information extraction unit. Based on the above, a time difference calculation unit that calculates a time difference at the time of capturing the broadcast content data and the communication content data, and distribution of the communication content data according to the time difference calculated by the time difference calculation unit It is made to function as a distribution apparatus request control part which performs a request.

  A stable broadcasting / communication cooperation service can be realized by reducing a time difference at the time of data acquisition between broadcasting-related content data obtained by receiving a broadcast and communication-related content data obtained by receiving a distribution.

1 is a block diagram showing an overall configuration of a transmission / reception system to which a receiving apparatus according to a first embodiment of the present invention is applied. It is a block diagram which shows the function structure of the transmitter in the same embodiment. It is a block diagram which shows the function structure of the delivery apparatus in the embodiment. It is a block diagram which shows the function structure of the receiver in the same embodiment. It is a figure which shows the data structure of the delay time management table memorize | stored in the delay time management part of a receiver. 4 is a flowchart illustrating a flow of transmission / reception of broadcast-type content data and communication-type content data in the transmission device, the distribution device, and the reception device in the embodiment. In the same embodiment, it is a flowchart which shows the procedure of the process in which a receiver selects a delivery apparatus. It is a block diagram which shows the function structure of the delivery apparatus which is 1st Embodiment of this invention. It is a block diagram which shows the function structure of the receiver in the same embodiment. In the same embodiment, it is a flowchart which shows the procedure of the process in which a receiver selects a delivery apparatus.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.
[First Embodiment]
FIG. 1 is a block diagram showing an overall configuration of a transmission / reception system to which a receiving apparatus according to a first embodiment of the present invention is applied. As shown in the figure, the transmission / reception system 1 includes a transmission device 10, a transmission antenna 20, a transmission side network 30, distribution devices 40-1 to 40-3, a network 50, and a reception device 60. Composed.
The transmission device 10 and the distribution devices 40-1 to 40-3 are connected via the transmission side network 30. The receiving device 60 is installed within a range where the broadcast radio wave W transmitted by the transmitting antenna 20 can be received, and is connected to the network 50. The sending side network 30 and the network 50 are connected as a communication path. Accordingly, the distribution apparatuses 40-1 to 40-3 and the receiving apparatus 60 are connected to be communicable via the transmission side network 30 and the network 50.

In FIG. 1, a transmission device 10, a transmission antenna 20, a transmission-side network 30, and distribution devices 40-1 to 40-3 are installed in a broadcasting station facility. The receiving device 60 is a device owned or managed by the viewer.
The transmission antenna 20 may be installed separately from the broadcasting station facility. In the following description, each device in the distribution devices 40-1 to 40-3 may be referred to as a distribution device 40. Further, for convenience of explanation, in the present embodiment, the number of distribution devices 40 is three and the number of reception devices 60 is one, but these numbers are illustrative and are not limited.

  The transmission device 10 is a device that converts broadcast-type content data to be broadcast into a broadcast signal and transmits the broadcast signal to the transmission antenna 20. Broadcast content data is content data of a broadcast program including video and / or audio. The transmission device 10 encodes a source of a broadcast program produced by editing video and / or audio material, and converts the format of the encoded stream into a transport stream (TS) to generate a broadcast system. Generate content data.

  Specifically, the transmission apparatus 10 encodes the source of a broadcast program and generates an elementary stream (ES). The transmitting apparatus 10 then generates a DTS (Decoding Time Stamp) generated based on an STC (System Time Clock; system clock) managed by the own apparatus, and a PTS (Presentation Time Stamp); Information) is added to the elementary stream to generate broadcast content data. The time management information (DTS and PTS) as these time stamps is information provided in the elementary stream in association with a predetermined point in content (video, audio, etc.) in content data having a length in the time direction. . DTS and PTS are, for example, representation of time having an accuracy of 90 KHz in 33 bits (corresponding to about 95444 seconds). Based on the time management information, the receiving device 60, which is a device on the decoding side, performs a predetermined operation. That is, the receiving device 60 decodes the broadcast content data at the time indicated by the DTS, and outputs (presents) the decoded content at the time indicated by the PTS.

  The transmission antenna 20 sends out a broadcast signal supplied from the transmission device 10 as a broadcast radio wave W in the air.

The distribution device 40 retains (stores) communication content data. This communication-type content data is content data related to broadcast-type content data, and is data including video and / or audio. Similarly to broadcast content data, communication content data is data obtained by encoding a source produced from video and / or audio and converting the format of this encoded stream to TS. For example, when the broadcast content data is content data of a drama program, the communication content data is caption data of the drama program.
The communication content data stored in each of the distribution devices 40-1 to 40-3 are all data having the same content.

  The distribution device 40 reads the communication system content data, changes the time management information (PTS) added in advance to the communication system content data to the same information as the PTS added to the broadcast system content data, and after this change The communication system content data is distributed to the receiving device 60. Specifically, the distribution device 40 synchronizes (genlocks) the STC managed by the own device with the STC acquired from the transmission device 10. Then, the distribution device 40 replaces the PTS added to the stored communication system content data with the PTS generated based on the synchronously coupled STC. Then, the distribution apparatus 40 transmits the communication system content data in which the PTS is replaced to the reception apparatus 60.

  The receiving device 60 receives the broadcast radio wave W, takes in a broadcast signal, and extracts broadcast content data from the broadcast signal. In addition, the receiving device 60 takes in communication-related content data supplied from one of the distribution devices 40-1 to 40-3 selected from the distribution devices 40-1. The receiving device 60 extracts the PTS at the same time from each of the broadcast-type content data and the communication-type content data, calculates a difference value between these two PTSs, and calculates the time difference of the communication-type content data with respect to the broadcast-type content data from the difference value. Calculate a certain delay time. The receiving device 60 calculates a delay time for each of the distribution devices 40-1 to 40-3, selects the distribution device 40 corresponding to the shortest delay time, and communicates with the distribution device 40. Establish.

  Then, the receiving device 60 decodes the broadcast content data at a timing based on the DTS included in the broadcast content data to generate broadcast-based decoded content data. In addition, the receiving device 60 takes in the communication content data supplied from the distribution device 40 that has established communication, decodes the communication content data at a timing based on the DTS included in the communication content data, and decodes the communication content. Generate data. Then, the receiving device 60 outputs the broadcast-based decoded content data at a timing based on the PTS included in the broadcast-type content data, and outputs the communication-based decoded content data at a timing based on the PTS included in the communication-type content data.

The sending side network 30 is a telecommunication line that transmits STC, which is a system clock, between the transmitting device 10 and the distribution devices 40-1 to 40-3.
The network 50 is a telecommunication line to which the receiving device 60 is connected, and is a computer network that is also connected to the Internet.

  FIG. 2 is a block diagram illustrating a functional configuration of the transmission device 10. As shown in the figure, the transmission apparatus 10 includes a system clock generation unit 101, a content storage unit 102, a content encoding unit 103, a time stamp addition unit 104, a content buffer 105, a broadcast signal transmission unit 106, and the like. Is provided.

  The system clock generation unit 101 includes, for example, an STC counter that counts up with a frequency of 27 MHz. The system clock generation unit 101 generates PCR (PCR1) that is system clock data based on STC (STC1) that is an output value of the STC counter. This PCR is also time management information. The system clock generation unit 101 supplies STC1 and PCR1 to the time stamp addition unit 104, and transmits STC1 to the distribution devices 40-1 to 40-3.

The content storage unit 102 is a storage device that stores the source of a broadcast program produced by editing video and / or audio material. The content storage unit 102 is realized by, for example, a magnetic hard disk device or a semiconductor disk device.
The content encoding unit 103 reads a broadcast program source from the content storage unit 102, encodes the source, and generates an elementary stream. Then, the content encoding unit 103 converts the elementary stream into a PES (Packetized Elementary Stream) and supplies it to the time stamp adding unit 104.

  Time stamp adding section 104 takes in STC1 and PCR1 supplied from system clock generation section 101, and generates DTS (DTS1) and PTS (PTS1) based on STC1 and PCR1. Also, the time stamp adding unit 104 multiplexes PCR1, DTS1, PTS1, and elementary stream PES, converts the format into TS, generates broadcast-type content data, and supplies the broadcast-type content data to the content buffer 105. .

The content buffer 105 buffers broadcast content data and supplies it to the broadcast signal transmission unit 106.
The broadcast signal transmission unit 106 reads the broadcast content data buffered in the content buffer 105, converts the broadcast content data into a broadcast signal, and transmits the broadcast signal to the transmission antenna 20.

  FIG. 3 is a block diagram illustrating a functional configuration of the distribution apparatus 40. As shown in the figure, the distribution apparatus 40 includes a system clock generation unit 401, a communication content storage unit 402, a content buffer 403, and a communication content transmission unit 404.

  The system clock generation unit 401 receives and captures STC (STC1) supplied from the transmission apparatus 10. The system clock generation unit 401 includes an STC counter that counts up with a frequency of 27 MHz. The system clock generation unit 401 synchronously couples STC (STCs), which is an output value of the STC counter, to the captured STC1. Thereby, STCs becomes equal to STC1. The system clock generation unit 401 generates PTS (PTSs) based on STCs and supplies the PTSs to the content buffer 403. Thereby, PTSs becomes equal to PTS1.

  The communication system content storage unit 402 is a storage device that stores communication system content data. The communication content storage unit 402 is realized by, for example, a magnetic hard disk device or a semiconductor disk device. A control unit (not shown) reads communication content data from the communication content storage unit 402 and supplies the communication content data to the content buffer 403.

The content buffer 403 buffers the communication content data read from the communication content storage unit 402, changes the PTS included in the communication content data to PTSs, and converts the changed communication content data to the communication content. The data is supplied to the transmission unit 404.
The communication system content transmission unit 404 transmits the communication system content data whose time management information is changed from PTS to PTSs to the receiving device 60.

  FIG. 4 is a block diagram illustrating a functional configuration of the receiving device 60. As shown in the figure, the receiving apparatus 60 includes a broadcast content acquisition unit 601, a separation unit 602, a video buffer 603, an audio buffer 604, a system buffer 605, a system decoder 606, and a system control unit 607. A system clock reproduction unit 608, a video decoder 609, and an audio decoder 610. Furthermore, the receiving device 60 includes a communication content acquisition unit 611, a separation unit 612, a video buffer 613, an audio buffer 614, a video decoder 615, and an audio decoder 616. Furthermore, the receiving device 60 includes a delay time calculation unit (time difference calculation unit) 617, a delay time management unit 618, a distribution device request control unit 619, a video output unit 620, and an audio output unit 621.

The broadcast content acquisition unit 601 receives the broadcast radio wave W, takes in a broadcast signal, extracts broadcast content data from the broadcast signal, and supplies the broadcast content data to the separation unit 602.
The separation unit 602 takes in the broadcast content data supplied from the broadcast content acquisition unit 601 and separates the broadcast content data into video data, audio data, and system data. Video data and audio data are elementary streams. Then, the separation unit 602 supplies video data to the video buffer 603, supplies audio data to the audio buffer 604, and supplies system data to the system buffer 605.

The video buffer 603 takes in the video data supplied from the separation unit 602 and buffers it.
The audio buffer 604 takes in the audio data supplied from the separation unit 602 and buffers it.
The system buffer 605 takes in the system data supplied from the separation unit 602 and buffers it.

The system decoder 606 takes in the system data buffered by the system buffer 605 and extracts PCR (PCR1), PSI / SI, and the like. Then, the system decoder 606 supplies the PCR to the system clock reproduction unit 608 and supplies the PSI / SI to the system control unit 607.
The system control unit 607 takes in the PSI / SI supplied from the system decoder 606 and manages programs and program information.
The system clock reproduction unit 608 takes in the PCR supplied from the system decoder 606. The system clock recovery unit 608 includes an STC counter that counts up at a frequency of 27 MHz, and calibrates the STC that is the output value of this STC counter based on the captured PCR. Then, the system clock reproduction unit 608 controls the video decoder 609 and the audio decoder 610 based on the calibrated STC.

  The video decoder 609 takes in the video data buffered by the video buffer 603. The video decoder 609 extracts PTS (PTS1) that is time management information from the captured video data, and supplies this PTS to the delay time calculation unit 617 and the video output unit 620. The video decoder 609 extracts DTS (DTS1) from the video data, decodes the video data based on the DTS to generate broadcast-system decoded video data, and sends the broadcast-system decoded video data to the video output unit 620. Supply.

  The audio decoder 610 takes in the audio data buffered by the audio buffer 604. The audio decoder 610 extracts a PTS from the captured audio data and supplies the PTS to the audio output unit 621. The audio decoder 610 extracts a DTS from the audio data, decodes the audio data based on the DTS to generate broadcast-system decoded audio data, and supplies the broadcast-system decoded audio data to the audio output unit 621.

The communication content acquisition unit 611 receives and takes in communication content data, and supplies the communication content data to the separation unit 612.
The separation unit 612 takes in the communication system content data supplied from the communication system content acquisition unit 611 and separates the communication system content data into video data and audio data. Video data and audio data are elementary streams. Then, the separation unit 612 supplies video data to the video buffer 613 and supplies audio data to the audio buffer 614.
The video buffer 613 takes in the video data supplied from the separation unit 612 and buffers it.
The audio buffer 614 takes in the audio data supplied from the separation unit 612 and buffers it.

  The video decoder 615 takes in the video data buffered by the video buffer 613. The video decoder 615 extracts PTS (PTSs) that is time management information from the captured video data, and supplies the PTS to the delay time calculation unit 617. Also, the video decoder 615 extracts DTS (DTSs) from the video data, decodes the video data based on the DTS to generate communication system decoded video data, and transmits the communication system decoded video data to the video output unit 620. Supply.

  The audio decoder 616 takes in the audio data buffered by the audio buffer 614. The audio decoder 616 extracts the DTS from the audio data, decodes the audio data based on the DTS to generate communication system decoded audio data, and supplies the communication system decoded audio data to the audio output unit 621.

  The video decoder 609 and the video decoder 615 are time management information extraction units.

  The delay time calculation unit 617 takes in the broadcast PTS (PTS1) supplied from the video decoder 609 and takes in the communication PTS (PTSs) supplied from the video decoder 615, and communicates with the broadcast PTS. The difference value of PTS is calculated. Then, based on the difference value, the delay time calculation unit 617 calculates the delay time of the communication content data with respect to the broadcast content data, and supplies this delay time to the delay time management unit 618. The delay time is calculated based on the difference value of PTS and 90 KHz which is the frequency of counting up PTS.

The delay time management unit 618 stores a delay time management table. The delay time management table includes, for each of the distribution devices 40-1 to 40-3, information for identifying the distribution device 40, location information of communication system content data held by the distribution device 40, and a delay time corresponding to the distribution device 40. Is table data in which The delay time management unit 618 takes in the delay time supplied from the delay time calculation unit 617 and substitutes this delay time into the delay time management table. Details of the delay time management table will be described later.
Also, the delay time management unit 618 extracts location information corresponding to the shortest delay time in the delay time management table, and supplies this location information to the distribution apparatus request control unit 619.

  The distribution device request control unit 619 takes the location information supplied from the delay time management unit 618, generates a distribution device connection request signal including the location information, and transmits the distribution device connection request signal to the corresponding distribution device 40. To do.

  The video output unit 620 captures the broadcast-system decoded video data supplied from the video decoder 609 and also captures the communication-system decoded video data supplied from the video decoder 615. Are synchronized based on the PTS supplied from the video decoder 609. Then, the video output unit 620 synthesizes the synchronized broadcast-system decoded video data and communication-system decoded video data with each other or maps them to a composite window, and then converts and outputs the video signals.

  The audio output unit 621 takes in the broadcast-system decoded audio data supplied from the audio decoder 610 and also receives the communication-system decoded audio data supplied from the audio decoder 616, and these broadcast-system decoded audio data, communication-system decoded audio data, and Are synchronized based on the PTS supplied from the audio decoder 610. The audio output unit 621 converts the synchronized broadcast-system decoded audio data and communication-system decoded audio data into an audio signal and outputs the audio signal.

  FIG. 5 is a diagram illustrating a data configuration of a delay time management table stored in the delay time management unit 618 of the receiving device 60. As shown in the figure, the delay time management table includes, for each of the distribution devices 40-1 to 40-3, “distribution device name” that is information for identifying the distribution device 40, and communication contents held by the distribution device 40. This is data in which “distribution device URL (Uniform Resource Locator)”, which is data location information, is associated with “delay time”.

Next, the operation of the transmission / reception system 1 in the first embodiment of the present invention will be described.
FIG. 6 is a flowchart showing a flow of transmission / reception of broadcast-type content data and communication-type content data in the transmission apparatus 10, the distribution apparatus 40, and the reception apparatus 60.
First, the processing of the transmission device 10 will be described.
In step S101, the system clock generation unit 101 generates PCR (PCR1) based on STC (STC1) that is an output value of the built-in STC counter, supplies STC1 and PCR1 to the time stamp addition unit 104, and supplies STC1. It transmits to the delivery apparatuses 40-1 to 40-3.

  Next, in step S102, the content encoding unit 103 reads the source of the broadcast program from the content storage unit 102, encodes the source, and generates an elementary stream. Next, the content encoding unit 103 converts the elementary stream into PES and supplies the PES to the time stamp adding unit 104. Next, time stamp adding section 104 takes in STC1 and PCR1 supplied from system clock generation section 101, and generates DTS (DTS1) and PTS (PTS1) as time management information based on STC1 and PCR1. . Next, the time stamp adding unit 104 multiplexes PCR1, DTS1, PTS1, and elementary stream PES, converts the format into TS, generates broadcast-type content data, and supplies the broadcast-type content data to the content buffer 105. To do.

  Next, in step S <b> 103, the broadcast signal transmission unit 106 reads the broadcast content data stored in the content buffer 105, converts the broadcast content data into a broadcast signal, and transmits the broadcast signal to the transmission antenna 20. Next, when the transmission antenna 20 receives a broadcast signal, the transmission antenna 20 transmits the broadcast signal as a broadcast radio wave W into the air.

Next, processing of the distribution device 40 will be described.
In step S201, the system clock generation unit 401 receives the STC (STC1) transmitted by the system clock generation unit 101 of the transmission device 10 in the process of step S101.
Next, in step S202, the system clock generation unit 401 synchronously couples STC (STCs), which is an output value of the built-in STC counter, with the STC1 received in the process of step S101. Thereby, STCs becomes equal to STC1. Next, the system clock generation unit 401 generates PTS (PTSs) based on the STCs, and supplies the PTSs to the content buffer 403. Thereby, PTSs becomes equal to PTS1.

Next, in step S <b> 203, the control unit of the distribution apparatus 40 reads the communication system content data stored in the communication system content storage unit 402 and supplies the communication system content data to the content buffer 403.
In step S <b> 204, the content buffer 403 changes the PTS included in the buffered communication content data to PTSs and supplies the changed communication content data to the communication content transmitter 404.
Next, in step S <b> 205, the communication system content transmission unit 404 transmits the communication system content data whose time management information is changed from PTS to PTSs to the receiving device 60.

Next, processing of the receiving device 60 will be described.
In step S301, the broadcast content acquisition unit 601 receives the broadcast radio wave W transmitted by the transmission antenna 20 in the process of step S103, takes in the broadcast signal, and extracts the broadcast content data from the broadcast signal.
Next, in step S302, the communication-type content acquisition unit 611 transmits the communication-type content data to which the PTS whose value is PTSs is transmitted, which is transmitted by the communication-type content transmission unit 404 of the distribution device 40 in the process of step S205. take in.

FIG. 7 is a flowchart illustrating a procedure of processing in which the receiving device 60 selects the distribution device 40.
In step S <b> 311, the broadcast content acquisition unit 601 receives the broadcast radio wave W transmitted from the transmission antenna 20, takes in a broadcast signal, and extracts broadcast content data from the broadcast signal. Next, the separation unit 602 separates the broadcast content data and supplies the video data to the video buffer 603. Next, the video decoder 609 reads the video data buffered by the video buffer 603, extracts a broadcast PTS (PTS 1) from the video data, and supplies this PTS to the delay time calculation unit 617.

  Next, in step S312, the delay time management unit 618 initializes the stored delay time management table. The initialization of the delay time management table means, for example, that the value assigned to the item “delay time” in the delay time management table is null.

  Next, in step S313, the delay time management unit 618 refers to the delay time management table and determines whether there is a record for which the delay time has not been calculated (the substitution value is null). If the delay time management unit 618 determines that there is a record for which the delay time has not been calculated as a result of the determination (S313: YES), the process proceeds to step S314. If the management unit 618 determines (S313: NO), the process proceeds to step S318.

  In step S314, the distribution apparatus request control unit 619 generates a distribution apparatus connection request signal including the location information of the communication system content data in the record for which the delay time has not been calculated, and distributes the distribution apparatus connection request signal corresponding to the distribution apparatus connection request signal. Transmit to device 40.

  Next, in step S315, the communication-type content acquisition unit 611 takes in the communication-type content data transmitted from the distribution apparatus 40 that has received the distribution apparatus connection request signal. Next, the separation unit 612 separates the communication content data and supplies the video data to the video buffer 613. Next, the video decoder 615 reads the video data buffered by the video buffer 613, extracts the PTS from the video data, and supplies the PTS (PTSs) of this communication system to the delay time calculation unit 617.

Next, in step S316, the delay time calculation unit 617 calculates a difference value of the communication PTS with respect to the broadcast PTS. Next, the delay time calculation unit 617 calculates the time difference (delay time) of the communication content data with respect to the broadcast content data based on the difference value, and supplies this delay time to the delay time management unit 618.
Next, in step S317, the delay time management unit 618 substitutes the delay time supplied from the delay time calculation unit 617 into the delay time management table.
Next, the delay time management unit 618 proceeds to the process of step S313.

In step S318, the delay time management unit 618 extracts location information corresponding to the shortest delay time in the delay time management table, and supplies this location information to the distribution apparatus request control unit 619.
Next, in step S319, the distribution device request control unit 619 takes the location information supplied from the delay time management unit 618, generates a distribution device connection request signal including the location information, and outputs the distribution device connection request signal. It transmits to the corresponding delivery apparatus 40.

According to the first embodiment of the present invention, for each of the distribution devices 40-1 to 40-3, the receiving device 60 receives the PTS included in the communication content data and the PTS included in the broadcast content data at the same time. In comparison, the distribution device 40 that selects the shortest delay time of the PTS of the communication content data relative to the PTS of the broadcast content data is selected.
Thereby, the receiving device 60 can acquire communication system content data in which the time difference between the broadcast system content data and the communication system content data is minimized.

[Second Embodiment]
The second embodiment of the present invention is partially different from the first embodiment in the functional configuration of the distribution device and the receiving device. Therefore, in the present embodiment, the distribution devices 40-1 to 40-3 are described as distribution devices 40a-1 to 40a-3, and the reception device 60 is described as a reception device 60a. In addition, about the structure same as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  FIG. 8 is a block diagram illustrating a functional configuration of the distribution device 40a. In the drawing, the distribution device 40a has a configuration in which the system clock generation unit 401 and the content buffer 403 in the distribution device 40 are changed to a system clock generation unit 401a and a content buffer 403a.

  The system clock generation unit 401a receives and captures the STC (STC1) supplied from the transmission device 10. The system clock generation unit 401a includes an STC counter that counts up with a frequency of 27 MHz. The system clock generation unit 401a synchronously couples STC (STCs), which is the output value of the STC counter, to the captured STC1. Thereby, STCs becomes equal to STC1. The system clock generation unit 401 a generates PCR (PCRs) that is system clock data (time management information) based on the STCs, and supplies the PCRs to the content buffer 403. This makes PCRs equal to PCR1.

  The content buffer 403a buffers the communication content data read from the communication content storage unit 402, changes the PCR included in the communication content data to PCRs, and converts the changed communication content data to the communication content. The data is supplied to the transmission unit 404.

  Therefore, the communication system content transmission unit 404 of the distribution apparatus 40a transmits the communication system content data in which the time management information is changed from PCR to PCRs to the reception apparatus 60a.

FIG. 9 is a block diagram illustrating a functional configuration of the receiving device 60a. In the figure, a receiving device 60a is newly provided with a system buffer 622 and a system decoder 623, and a system clock reproducing unit 608, a separating unit 612, and a delay time calculating unit 617 in the receiving device 60 are combined with a system clock reproducing unit 608a. The separation unit 612a and the delay time calculation unit (time difference calculation unit) 617a are changed.
The system clock recovery unit 608a and the system decoder 623 are time management information extraction units.

  The separation unit 612a takes in the communication content data supplied from the communication content acquisition unit 611 and separates the communication content data into video data, audio data, and system data. Video data and audio data are elementary streams. Then, the separation unit 612 a supplies video data to the video buffer 613, supplies audio data to the audio buffer 614, and supplies system data to the system buffer 622.

The system buffer 622 takes in the system data supplied from the separation unit 612a and buffers it.
The system decoder 623 takes in the system data buffered by the system buffer 622 and extracts PCRs (PCRs) of the communication system. Then, the system decoder 623 supplies the PCR to the delay time calculation unit 617a.

  The system clock reproduction unit 608a takes in the broadcast PCR (PCR1) supplied from the system decoder 606. The system clock recovery unit 608a includes an STC counter that counts up at a frequency of 27 MHz, and calibrates the STC that is the output value of this STC counter based on the captured PCR. Then, the system clock reproduction unit 608a supplies the PCR to the delay time calculation unit 617a. In addition, the system clock reproduction unit 608a controls the video decoder 609 and the audio decoder 610 based on the calibrated STC.

  The delay time calculation unit 617a takes in the broadcast-type PCR (PCR1) supplied from the system clock reproduction unit 608a, and takes in the communication-type PCR (PCRs) supplied from the system decoder 623 to communicate with the broadcast-type PCR. The difference value of the PCR of the system is calculated. Then, based on the difference value, the delay time calculation unit 617a calculates the delay time of the communication content data with respect to the broadcast content data, and supplies this delay time to the delay time management unit 618. The delay time is calculated based on the differential value of PCR and 27 MHz which is the frequency of PCR count-up.

Next, the operation of the transmission / reception system 1 in the second embodiment of the present invention will be described.
The flow of transmission / reception of broadcast content data and communication content data in the transmission device 10, the distribution device 40a, and the reception device 60a will be described with reference to the flowchart of FIG. 6 described in the first embodiment. Note that in the process according to the flowchart of the same figure in the present embodiment, the process different from the first embodiment is the process of the distribution device 40a, and therefore only the process of the distribution device 40a will be described here.

In step S201, the system clock generation unit 401a receives the STC (STC1) transmitted by the system clock generation unit 101 of the transmission device 10 in the process of step S101.
Next, in step S202, the system clock generation unit 401a synchronously couples STC (STCs), which is an output value of the built-in STC counter, with the STC1 received in the process of step S101. Thereby, STCs becomes equal to STC1. Next, the system clock generation unit 401a generates PCR (PCRs) based on the STCs and supplies the PCRs to the content buffer 403a. This makes PCRs equal to PCR1.

Next, in step S203, the control unit of the distribution device 40a reads the communication content data stored in the communication content storage unit 402 and supplies the communication content data to the content buffer 403a.
In step S <b> 204, the content buffer 403 a changes the PCR included in the buffered communication content data to PCRs, and supplies the changed communication content data to the communication content transmitter 404.
Next, in step S205, the communication system content transmission unit 404 transmits the communication system content data in which the time management information is changed from PCR to PCRs to the receiving device 60a.

FIG. 10 is a flowchart illustrating a procedure of processing in which the receiving device 60a selects the distribution device 40a.
In step S411, the broadcast content acquisition unit 601 receives the broadcast radio wave W transmitted from the transmission antenna 20, receives a broadcast signal, and extracts broadcast content data from the broadcast signal. Next, the separation unit 602 separates the broadcast content data and supplies the system data to the system buffer 605. Next, the system decoder 606 reads the system data buffered by the system buffer 605, extracts a broadcast-system PCR (PCR1) from the system data, and supplies this PCR to the system clock reproduction unit 608a. Next, the system clock reproduction unit 608a supplies the broadcast PCR to the delay time calculation unit 617a.

  Next, in step S412, the delay time management unit 618 initializes the stored delay time management table. The initialization of the delay time management table means, for example, that the value assigned to the item “delay time” in the delay time management table is null.

  Next, in step S413, the delay time management unit 618 refers to the delay time management table and determines whether there is a record for which the delay time has not been calculated (the substitution value is null). If the delay time management unit 618 determines that there is a record for which the delay time has not been calculated as a result of the determination (S413: YES), the process proceeds to step S414. If the management unit 618 determines (S413: NO), the process proceeds to step S418.

  In step S414, the distribution apparatus request control unit 619 generates a distribution apparatus connection request signal including the location information of the communication content data in the record for which the delay time has not been calculated, and distributes the distribution apparatus connection request signal corresponding to the distribution apparatus connection request signal. Transmit to device 40a.

  Next, in step S415, the communication-type content acquisition unit 611 takes in the communication-type content data transmitted from the distribution apparatus 40a that has received the distribution apparatus connection request signal. Next, the separation unit 612a separates the communication system content data and supplies the system data to the system buffer 622. Next, the system decoder 623 reads the system data buffered by the system buffer 622, extracts the PCR from the system data, and supplies the communication system PCRs (PCRs) to the delay time calculation unit 617a.

Next, in step S416, the delay time calculation unit 617a calculates the difference value of the communication PCR with respect to the broadcast PCR. Next, the delay time calculation unit 617a calculates a time difference (delay time) of the communication content data with respect to the broadcast content data based on the difference value, and supplies this delay time to the delay time management unit 618.
Next, in step S417, the delay time management unit 618 substitutes the delay time supplied from the delay time calculation unit 617a into the delay time management table.
Next, the delay time management unit 618 proceeds to the process of step S413.

In step S418, the delay time management unit 618 extracts location information corresponding to the shortest delay time in the delay time management table, and supplies this location information to the distribution apparatus request control unit 619.
Next, in step S419, the distribution device request control unit 619 takes in the location information supplied from the delay time management unit 618, generates a distribution device connection request signal including the location information, and outputs the distribution device connection request signal. It transmits to the corresponding distribution apparatus 40a.

According to the second embodiment of the present invention, the receiving device 60a performs, for each of the distribution devices 40a-1 to 40a-3, the PCR included in the communication content data and the PCR included in the broadcast content data at the same time. In comparison, the distribution device 40a that minimizes the delay time of the PCR of the communication content data with respect to the PCR of the broadcast content data is selected.
Thereby, the receiving device 60a can acquire the communication content data that minimizes the time difference between the broadcast content data and the communication content data.

  As described in detail above, according to the first embodiment and the second embodiment, the receivers 60 and 60a can select and communicate the distribution device 40 with a light traffic load on the network 50, and the receiver's internal It is possible to prevent abnormal operation caused by buffer overflow or underflow. Thereby, according to each embodiment, the cooperation service of more stable broadcasting and communication is realizable.

  In the first embodiment, the PTS is used to measure the delay time of the communication content data with respect to the broadcast content data. However, a DTS may be used instead of this PTS.

  In addition, the distribution devices 40-1 to 40-3 in the first embodiment and the distribution devices 40a-1 to 40a-3 in the second embodiment are devices managed by a broadcasting station. In addition, these distribution devices 40 and 40a may be devices managed by a service provider other than the broadcasting station. In this case, for example, all of the distribution devices 40-1 to 40-3 and the distribution devices 40a-1 to 40a-3 may be managed by the same service provider, or managed for each of the distribution devices 40 and 40a. You may be different. Even when the administrators are different for each of the distribution devices 40 and 40a, the communication system content data stored in the distribution devices 40-1 to 40-3 and the distribution devices 40a-1 to 40a-3 are the same data.

  Moreover, you may make it implement | achieve a part of function of the receiver 60 which is embodiment mentioned above with a computer. In this case, the reception program for realizing the control function is recorded on a computer-readable recording medium, and the reception program recorded on the recording medium is read by the computer system and executed by the computer system. May be. This computer system includes an operating system (OS) and hardware of peripheral devices. The computer-readable recording medium is a portable recording medium such as a flexible disk, a magneto-optical disk, an optical disk, or a memory card, and a storage device such as a magnetic hard disk or a solid state drive provided in the computer system. Furthermore, a computer-readable recording medium dynamically holds a program for a short time, such as a computer network such as the Internet, and a communication line when transmitting a program via a telephone line or a cellular phone network. In addition, a server that holds a program for a certain period of time, such as a volatile memory inside a computer system serving as a server device or a client in that case, may be included. Further, the above reception program may be for realizing a part of the above-described functions, and further, the above-described functions are realized by a combination with a program already recorded in the computer system. Also good.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the specific structure is not restricted to that embodiment, The design of the range which does not deviate from the summary of this invention, etc. are included.

DESCRIPTION OF SYMBOLS 1 Transmission / reception system 10 Transmission apparatus 20 Transmission antenna 30 Transmission side network 40-1 to 40-3, 40a-1 to 40a-3 Distribution apparatus 50 Network 60, 60a Reception apparatus 101 System clock generation part 102 Content storage part 103 Content encoding Unit 104 time stamp addition unit 105 content buffer 106 broadcast signal transmission unit 401, 401a system clock generation unit 402 communication system content storage unit 403, 403a content buffer 404 communication system content transmission unit 601 broadcast system content acquisition unit 602 separation unit 603 video buffer 604 Audio buffer 605 System buffer 606 System decoder 607 System control unit 608, 608a System clock reproduction unit 609 Video decoder 610 Audio data Coder 611 Communication system content acquisition unit 612, 612a Separation unit 613 Video buffer 614 Audio buffer 615 Video decoder 616 Audio decoder 617, 617a Delay time calculation unit (time difference calculation unit)
618 Delay time management unit 619 Distribution device request control unit 620 Video output unit 621 Audio output unit 622 System buffer 623 System decoder

Claims (3)

A broadcast-type content acquisition unit that takes in broadcast-type content data including first time management information broadcast from a transmission device;
A communication-type content acquisition unit that takes in communication-type content data including second time management information that is the same information as the first time management information distributed from a distribution device via an electric communication line;
The first time management information is extracted from the broadcast content data captured by the broadcast content acquisition unit, and the second time management information is extracted from the communication content data captured by the communication content acquisition unit. A time management information extraction unit to extract;
A time difference for calculating a time difference at the time of fetching the broadcast content data and the communication content data based on the first time management information and the second time management information extracted by the time management information extraction unit A calculation unit;
A distribution device request control unit configured to perform a distribution request for the communication system content data according to the time difference calculated by the time difference calculation unit;
A receiving apparatus comprising: The communication system content acquisition unit receives each communication system content data including second time management information, which is the same information as the first time management information, distributed from a plurality of distribution devices via an electric communication line. Capture,
The time management information extraction unit extracts the first time management information from the broadcast content data captured by the broadcast content acquisition unit, and the communication content data captured by the communication content acquisition unit. The second time management information is extracted from
The time difference calculation unit captures the broadcast content data and the communication content data based on the first time management information and the second time management information extracted by the time management information extraction unit. Calculate the time difference of time,
The distribution device request control unit makes a distribution request for the communication system content data to a distribution device corresponding to the shortest time among the time differences corresponding to the plurality of distribution devices calculated by the time difference calculation unit. The receiving apparatus according to claim 1. Computer
A broadcast-type content acquisition unit that takes in broadcast-type content data including first time management information broadcast from a transmission device;
A communication-type content acquisition unit that takes in communication-type content data including second time management information that is the same information as the first time management information distributed from a distribution device via an electric communication line;
The first time management information is extracted from the broadcast content data captured by the broadcast content acquisition unit, and the second time management information is extracted from the communication content data captured by the communication content acquisition unit. A time management information extraction unit to extract;
A time difference for calculating a time difference at the time of fetching the broadcast content data and the communication content data based on the first time management information and the second time management information extracted by the time management information extraction unit A calculation unit;
A distribution device request control unit configured to perform a distribution request for the communication system content data according to the time difference calculated by the time difference calculation unit;
Receiving program to function as

Images